Permutation lock



May 13, 1930. v. T. JULIN P-ERMUTATION LOCK Filed may 3, 1929 FigsPatented May 13, 1930 VICTOR'TEODOR JULN, OF DJURSI-IOLM-DANDERYD,SWEDEN PERMITTATION LOCK `Alflplication. filed May i3, '1929, Serial No.360,235, and in Austria November 9, `1921*?.

The invention relates to permutation locks and particularly to that typethereof, in which the bolt co-acts with rotary discs allowing theretraction of the bolt only, when these discs occupy a certainpredetermined position... y y, y.

Themain object ofthe invention is to increase the 'safety of such locksand another one is to reduce thecosts of manufacture.

This. is according to the invention realized by connecting to one of thesetting discs, which fits accurately into the correspondingrecess of thebolt, a cover, which, when this disc engages with the respective boltrecess, obstructs the access to the other -discs engag-v ing with theircorresponding bolt recesses s0 that there is a clearance.

In the drawing-by way of example as' one embodiment of the invention apadlock is illustrated.

Fig. 1 shows a sectional elevation,

Fig. 2 a horizontal sectional view according to the line lle-II of Fig.1,

Fig. 3 a horizontal sectional view according to the line III- III ofFig. 1 and Fig. 4 is a side-view (elevation).

The cylindrical casing 1 is formed with tubeslikeguides 2 for receivingthe legs of a shackle 3, said casing supporting an axle 4, on which thediscs 5, 6 and 7 are rotatably mounted. These discs engage with recesses8, 9, provided on each leg of the shackle and have arc-shaped notches(sweeps) 11 cut in their peripheries at diametrically opposedcircumferential points thereof. Each of the two discs 5 and 7 bears asmall handle 12 extending through a slot or window 13 of the casing so,that its endv can be moved along a scale 14. The disc 6 is connected toa cover 17 by means of an extension 16 projecting through a slot 15 ofthe casing.

For ensuring the effect aimed Vat by the present invention it isessential that the disc 6 lits exactly into the recesses 9, whilst theother discs 5 and 7 ought to be allowed to move within their recesses 8and 10 with a clearance.

For explaining the manner, how this arrangement operates, it may firstof all be assumed, that only the two discs 5 and 7 moving with aclearance in their shackle leg recesses are existing. The movability isdue to the fact, that in the manufacturing operations-accuracy cannotbepushed so far that two or several discs fit simultaneously V` with fullexactness into the shackle leg recesse's. Consequently, if the shackle bis pushed toward the casing or pulled away from it, .onlyone disc willcome to touch the lateral walll or sid-e of one of the shackle legrecesses 8 or 10 so as to cause strong friction thereon, as the accuracyof manufacturing cannot go so far, that the distance rz between theupper surfaces'of the discs is perfectly equal to the distanceV brbetween the sides of the recesses and that the distance @between thelower surfaces of these two discs be exactly equal to the distance cl.ln practice, particularly when wholesale manufacture by series isconcerned, these distances will al 70 ways differ for some fraction Vofa millimeter, owing to which inexactness, when the shackle and casingare pus-hed towards-each other or pulled in opposite directions,only'the one of the discs will abut by strong friction against one ofthe sides-'of the respective re cess, whilst the other discs may beturned moreor less withoutofe'ring any substanf n tial resistance. Ifnow the disc subjected to strong friction is turned while continuing to"303 push or pull the casing and the shackle, the p friction resistancewill remain effective. fBut as soon as the cuts. (sweeps) 11 of the discwill coincidewith the recesses of the shackle A legs, the 'friction'resistance will -suddenly 851 cease. Consequentlyby the resistance to'befelt during. the rotation to be effected in the i said manner kthe rightposition of this disc, that is to say the oneallowing the shackle` topass, can be foundout. lf now the discy is allowed to remain'inthisposition and cas` ing and shackle are again pushed or vpulled in thedescribed manner, the other disc will touch `one side wall of itscorresponding 95 shackle leg recesses so as t0 cause strong. frictionthereonand by turning now this second disc it may also be brought intosuch position as to allowrthe shackle to be pulled out. Consequently thelocky can beV opened without 1.00

other discs 5 and 7 show a certain clearance, Y the latter can only bebrought'to friction engagement with the sides of their respective legrecesses, when the exactly fitting disc is in its open position, that isto say the position allowing the shackle legs to pass. For the purposeof preventing such possibility a cover f 17 is connected tothe disc (i,which cover obstructs the access to the handles 12 and covers the scalesbelonging to them, as long as the disc 6 is in the said open position.

If the lock is to be opened, first of all the cover 17 has to be shiftedaside, whereby the cuts l1 of the disc comeout of engagement with therecesses9 of the shackle legs. Now the discs 5 and 7 are by means of thehandles 12 and by the aidof the scales lll turned into the openingposition and finally the cover 17- is turned back into its openposition. NOW the sweeps of all the discs are coinciding with therecesses of the shackle legs and the latter can be withdrawn from thepadlock.

The disc 6 may also be included in the permutation system, for whichpurpose the cover 17 connected to it may be provided with an indicator(pointer) 18 bearing upon a` scale 19, which is to be of such dimensionsand arranged so, that at all positions o f the disc 6, which arepossible, the access to the other discs is shut off by the. cover 17.

As with a lock according to the invention the movability of the discs 5and 7 does not cause any irregularity of their working, the

clearance between these discs and their respective shackle recesses maybe made rela tively large. If at the same time the'lower edge of theslots or windows 13 is made. sinuous (wave like) so, that thedepressions be-A tween two waves coincide with the divisions,

`of the scale, the wave crests will, when the discs are turned by meansof the handles 12, offer a resistance, the overcoming of which may befelt as well as heard, whereby the possibility is given of handling` thelock also in the Vnight time without light.

What I claim is 1 `A permutation lock comprising rotary discs with cuts,and a shackle having recesses in its legs for engaging said discs, ofwhich lonly one fits exactly into its respective leg re i havingrecesses therein, a setting disc exactly fitting into its shacklerecesses and provided With a cover. several discs movable with aclearance within their shackle recesses and provided with projections,which pass through openings of the casing, and a scale for setting thevdiscs by means of their projections, the lower edges of said openingshaving wave like form and the depressions of the waves thereofcoinciding with the divisions of the scale.` l Y 3. A permutation lockcomprising discs with cuts, and a shackle with recesses in itsV legs forengagement with said discs, of which only one fits exactly into itsrespective leg recess, whilst the others are movable within theirrecesses with aclearance, the accurately tting tumbler being providedwith a cover, which obstructs the access to the discsmovable withclearance, when the fitting disc is placed in its open positionand isprovided with an indicator bearing upon a scale. i

In testimony Vwhereof I have signed my name to this specification.

VICTOR TEODOR JULIN.

